Exploitalert - Database of Exploits

Winamp m3u Parsing Stack Overflow Vulnerability

CVE	Category	Price	Severity
CVE-2006-0476	CWE-119	Unknown	High

Author	Risk	Exploitation Type	Date
str0ke	High	Local	2006-02-15

CPE
cpe:cpe:/a:winamp:m3u_parser

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

http://cxsecurity.com/ascii/WLB-2006020008

Winamp m3u Parsing Stack Overflow Vulnerability iDefense Security Advisory 02.01.06 http://www.idefense.com/intelligence/vulnerabilities/display.php?id=377 February 1, 2006 I. BACKGROUND Winamp is a popular media player for Windows which supports many audio/video file formats. More information can be obtained from the vendors site at: http://winamp.com/player/ II. DESCRIPTION It has been found that a specially crafted m3u or pls file can overwrite a stack based buffer allowing for remote code execution. Example m3U file format: #EXTM3U #EXTINF:,VULN AAAA[...]AA Example pls file to trigger exploit: [playlist] numberofentries=1 File1=\01 01AAA[...]AAA This vulnerability is specific to the 5.11 version of Winamp and does not affect previous versions. III. ANALYSIS When Winamp is installed it registers the m3u extension so that such files will automatically open in Winamp. This exploit can be triggered by clicking on a link in a webpage, or from the use of malicious javascript. Exploitation is straight forward, using a long full path. This path can be either a filename or the UNC name for a fileshare, which does not have to exist. Public exploit code has been independently released for this vulnerability (http://www.spyinstructors.com). IV. DETECTION This exploit was tested with version 5.11 of Winamp. Previous versions were tested and found to not be exploitable. V. WORKAROUND Removing the file associations for the m3u and pls file extension may mitigate the risk of exploitation. VI. VENDOR RESPONSE The vendor has not responded to communication regarding this vulnerability. The vulnerability appears to have been silently fixed in Winamp 5.13 which is available for download at: http://www.winamp.com/player/ VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-0476 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 12/15/2005 Initial vendor notification 02/01/2006 Public disclosure IX. CREDIT This vulnerability was independently discovered by Alan Mccaig (b0f) b0fnet (at) yahoo (dot) com [email concealed] and Ruben Santamarta (ruben (at) reversemode (dot) com [email concealed]). Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp Free tools, research and upcoming events http://labs.idefense.com X. LEGAL NOTICES Copyright (c) 2006 iDefense, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice (at) idefense (dot) com [email concealed] for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.

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